<s>
Data	B-Operating_System
Format	I-Operating_System
Description	I-Operating_System
Language	I-Operating_System
(	O
DFDL	B-Operating_System
,	O
often	O
pronounced	O
daff-o-dil	O
)	O
,	O
published	O
as	O
an	O
Open	O
Grid	O
Forum	O
Proposed	O
Recommendation	O
in	O
January	O
2011	O
,	O
is	O
a	O
modeling	O
language	O
for	O
describing	O
general	O
text	O
and	O
binary	O
data	O
in	O
a	O
standard	O
way	O
.	O
</s>
<s>
A	O
DFDL	B-Operating_System
model	O
or	O
schema	O
allows	O
any	O
text	O
or	O
binary	O
data	O
to	O
be	O
read	O
(	O
or	O
"	O
parsed	O
"	O
)	O
from	O
its	O
native	O
format	O
and	O
to	O
be	O
presented	O
as	O
an	O
instance	O
of	O
an	O
information	O
set	O
.	O
</s>
<s>
The	O
same	O
DFDL	B-Operating_System
schema	O
also	O
allows	O
data	O
to	O
be	O
taken	O
from	O
an	O
instance	O
of	O
an	O
information	O
set	O
and	O
written	O
out	O
(	O
or	O
"	O
serialized	O
"	O
)	O
to	O
its	O
native	O
format	O
.	O
</s>
<s>
DFDL	B-Operating_System
is	O
descriptive	O
and	O
not	O
prescriptive	O
.	O
</s>
<s>
DFDL	B-Operating_System
is	O
not	O
a	O
data	O
format	O
,	O
nor	O
does	O
it	O
impose	O
the	O
use	O
of	O
any	O
particular	O
data	O
format	O
.	O
</s>
<s>
DFDL	B-Operating_System
achieves	O
this	O
by	O
building	O
upon	O
the	O
facilities	O
of	O
W3C	O
XML	O
Schema	O
1.0	O
.	O
</s>
<s>
The	O
motivations	O
for	O
this	O
approach	O
are	O
to	O
avoid	O
inventing	O
a	O
completely	O
new	O
schema	O
language	O
,	O
and	O
to	O
make	O
it	O
easy	O
to	O
convert	O
general	O
text	O
and	O
binary	O
data	O
,	O
via	O
a	O
DFDL	B-Operating_System
information	O
set	O
,	O
into	O
a	O
corresponding	O
XML	O
document	O
.	O
</s>
<s>
Educational	O
material	O
is	O
available	O
in	O
the	O
form	O
of	O
DFDL	B-Operating_System
Tutorials	O
,	O
videos	O
and	O
several	O
hands-on	O
DFDL	B-Operating_System
labs	O
.	O
</s>
<s>
DFDL	B-Operating_System
was	O
created	O
in	O
response	O
to	O
a	O
need	O
for	O
grid	O
APIs	O
to	O
be	O
able	O
to	O
understand	O
data	O
regardless	O
of	O
source	O
.	O
</s>
<s>
DFDL	B-Operating_System
takes	O
this	O
approach	O
and	O
evolves	O
it	O
into	O
an	O
open	O
standard	O
capable	O
of	O
describing	O
many	O
text	O
or	O
binary	O
data	O
formats	O
.	O
</s>
<s>
Work	O
continued	O
on	O
the	O
language	O
,	O
resulting	O
in	O
the	O
publication	O
of	O
a	O
DFDL	B-Operating_System
1.0	O
specification	O
as	O
OGF	O
Proposed	O
Recommendation	O
GFD.174	O
in	O
January	O
2011	O
.	O
</s>
<s>
A	O
of	O
DFDL	B-Operating_System
and	O
its	O
features	O
is	O
available	O
at	O
the	O
OGF	O
.	O
</s>
<s>
Implementations	O
of	O
DFDL	B-Operating_System
processors	O
that	O
can	O
parse	O
and	O
serialize	O
data	O
using	O
DFDL	B-Operating_System
schemas	O
are	O
available	O
.	O
</s>
<s>
IBM	O
has	O
a	O
production-ready	O
DFDL	B-Operating_System
1.0	O
streaming	O
parser	O
,	O
modeler	O
and	O
visual	O
tester	O
.	O
</s>
<s>
This	O
is	O
available	O
in	O
several	O
IBM	O
products	O
including	O
IBM	B-Application
App	I-Application
Connect	I-Application
Enterprise	I-Application
(	O
formerly	O
known	O
as	O
)	O
.	O
</s>
<s>
is	O
an	O
open-source	O
DFDL	B-Operating_System
processor	O
having	O
both	O
parser	O
and	O
unparser	O
,	O
as	O
well	O
as	O
integrations	O
into	O
Apache	B-Language
NiFi	I-Language
,	O
and	O
the	O
.	O
</s>
<s>
European	O
Space	O
Agency	O
project	O
includes	O
a	O
parser	O
DFDL4S	O
that	O
implements	O
a	O
subset	O
of	O
the	O
DFDL	B-Operating_System
1.0	O
specification	O
.	O
</s>
<s>
A	O
public	O
repository	O
for	O
DFDL	B-Operating_System
schemas	O
that	O
describe	O
commercial	O
and	O
scientific	O
data	O
formats	O
has	O
been	O
established	O
on	O
.	O
</s>
<s>
DFDL	B-Operating_System
schemas	O
for	O
formats	O
like	O
UN/EDIFACT	O
,	O
NACHA	O
,	O
MIL-STD-2045	O
,	O
NITF	O
,	O
and	O
ISO8583	O
are	O
available	O
for	O
free	O
download	O
.	O
</s>
<s>
To	O
additionally	O
model	O
the	O
physical	O
representation	O
of	O
the	O
data	O
stream	O
,	O
DFDL	B-Operating_System
augments	O
the	O
XML	O
schema	O
fragment	O
with	O
annotations	O
on	O
the	O
xs:element	O
and	O
xs:sequence	O
objects	O
,	O
as	O
follows	O
:	O
</s>
<s>
An	O
alternative	O
,	O
more	O
compact	O
syntax	O
is	O
also	O
provided	O
,	O
where	O
DFDL	B-Operating_System
properties	O
are	O
carried	O
as	O
non-native	O
attributes	O
on	O
the	O
XML	O
Schema	O
objects	O
themselves	O
.	O
</s>
<s>
The	O
goal	O
of	O
DFDL	B-Operating_System
is	O
to	O
provide	O
a	O
rich	O
modeling	O
language	O
capable	O
of	O
representing	O
any	O
text	O
or	O
binary	O
data	O
format	O
.	O
</s>
